<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>Simple Demo</title>

  <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
  <script src="https://unpkg.com/vue-qrcode-reader@5/dist/vue-qrcode-reader.umd.js"></script>
</head>
<body>
	<div id="app">
    <h1>Simple Demo</h1>

    <p style="color: red">{{ error }}</p>

    <p>Last result: <b>{{ result }}</b></p>

    <div style="border: 2px solid black">
  		<qrcode-stream :track="paintBoundingBox" @detect="onDetect" @error="onError"></qrcode-stream>
    </div>
	</div>
</body>
<script>
  const { createApp, ref } = Vue

  const result = ref('')
  const error = ref('')

  function paintBoundingBox(detectedCodes, ctx) {
    for (const detectedCode of detectedCodes) {
      const {
        boundingBox: { x, y, width, height }
      } = detectedCode

      ctx.lineWidth = 2
      ctx.strokeStyle = '#007bff'
      ctx.strokeRect(x, y, width, height)
    }
  }

  function onError(err) {
    error.value = `[${err.name}]: `

    if (err.name === 'NotAllowedError') {
      error.value += 'you need to grant camera access permission'
    } else if (err.name === 'NotFoundError') {
      error.value += 'no camera on this device'
    } else if (err.name === 'NotSupportedError') {
      error.value += 'secure context required (HTTPS, localhost)'
    } else if (err.name === 'NotReadableError') {
      error.value += 'is the camera already in use?'
    } else if (err.name === 'OverconstrainedError') {
      error.value += 'installed cameras are not suitable'
    } else if (err.name === 'StreamApiNotSupportedError') {
      error.value += 'Stream API is not supported in this browser'
    } else if (err.name === 'InsecureContextError') {
      error.value += 'Camera access is only permitted in secure context. Use HTTPS or localhost rather than HTTP.'
    } else {
      error.value += err.message
    }
  }

  function onDetect(detectedCodes) {
    result.value = JSON.stringify(
      detectedCodes.map(code => code.rawValue)
    )
  }

  const app = createApp({
    setup() {
      return { result, error, onDetect, onError, paintBoundingBox }
    }
  })
  app.use(VueQrcodeReader)
  app.mount('#app')
</script>
</html>
